remove obsolete dependencies to unapplicable ca options

Author: slobodanadamovic

x-pack/plugin/security/cli/src/main/java/org/elasticsearch/xpack/security/cli/CertificateTool.java

@@ -278,20 +278,13 @@ final void acceptInputFile() {
         }
 
         final void acceptCertificateAuthorityKeyUsage() {
-            OptionSpecBuilder builder = parser.accepts(
+            caKeyUsageSpec = parser.accepts(
                 "keyusage",
                 "comma separated key usages to use for the generated CA. "
                     + "defaults to '"
                     + Strings.collectionToCommaDelimitedString(DEFAULT_CA_KEY_USAGE)
                     + "'"
-            );
-            if (caPkcs12PathSpec != null) {
-                builder = builder.availableUnless(caPkcs12PathSpec);
-            }
-            if (caCertPathSpec != null) {
-                builder = builder.availableUnless(caCertPathSpec);
-            }
-            caKeyUsageSpec = builder.withRequiredArg();
+            ).withRequiredArg();
         }
 
         // For testing